/*
  Copyright 2021 Equinor.

  This file is part of the Open Porous Media project (OPM).

  OPM is free software: you can redistribute it and/or modify
  it under the terms of the GNU General Public License as published by
  the Free Software Foundation, either version 3 of the License, or
  (at your option) any later version.

  OPM is distributed in the hope that it will be useful,
  but WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  GNU General Public License for more details.

  You should have received a copy of the GNU General Public License
  along with OPM.  If not, see <http://www.gnu.org/licenses/>.
*/

#include <map>
#include <string>
#include <type_traits>

#include <fmt/format.h>

#include <opm/common/utility/OpmInputError.hpp>
#include <opm/parser/eclipse/Deck/Deck.hpp>
#include <opm/parser/eclipse/Deck/DeckKeyword.hpp>
#include <opm/parser/eclipse/Parser/ErrorGuard.hpp>
#include <opm/parser/eclipse/Parser/ParseContext.hpp>
#include <opm/simulators/flow/KeywordValidation.hpp>

namespace Opm
{

namespace KeywordValidation
{

    std::string get_error_report(const std::vector<ValidationError>& errors, const bool critical)
    {
        const std::string keyword_format = "  {keyword}: keyword not supported\n";
        const std::string item_format1 = "  {{keyword}}: invalid value '{}' for item {}\n";
        const std::string item_format2 = "  {{keyword}}: invalid value '{}' in record {} for item {}\n";
        const std::string location_format = "  In file: {file}, line {line}\n";

        std::string report;
        for (const ValidationError& err : errors) {
            if (err.critical == critical) {
                if (err.item_number && err.item_value) {
                    std::string message;
                    if (err.record_number == 0) {
                        message = fmt::format(item_format1, *(err.item_value), *(err.item_number));
                    } else {
                        message = fmt::format(item_format2, *(err.item_value), err.record_number, *(err.item_number));
                    }
                    report.append(OpmInputError::format(message, err.location));
                } else {
                    report.append(OpmInputError::format(keyword_format, err.location));
                }
                report.append(OpmInputError::format(location_format, err.location));
                if (err.user_message) {
                    report.append("  " + *(err.user_message) + "\n");
                }
                report.append("\n");
            }
        }

        if (!report.empty()) {
            // Remove the last two newlines.
            report.erase(report.length() - 2);
            // Prepend header and file name.
            report.insert(0, "Unsupported keywords or keyword items:\n\n");
        }
        return report;
    }

    void
    KeywordValidator::validateDeck(const Deck& deck, const ParseContext& parse_context, ErrorGuard& error_guard) const
    {
        // Make a vector with all problems encountered in the deck.
        std::vector<ValidationError> errors;
        for (const auto& keyword : deck)
            validateDeckKeyword(keyword, errors);

        // First report non-critical problems as a warning.
        auto warning_report = get_error_report(errors, false);
        if (!warning_report.empty()) {
            parse_context.handleError(
                ParseContext::SIMULATOR_KEYWORD_NOT_SUPPORTED, warning_report, std::nullopt, error_guard);
        }

        // Then report critical problems as an error.
        auto error_report = get_error_report(errors, true);
        if (!error_report.empty()) {
            parse_context.handleError(
                ParseContext::SIMULATOR_KEYWORD_NOT_SUPPORTED_CRITICAL, error_report, std::nullopt, error_guard);
        }
    }

    void KeywordValidator::validateDeckKeyword(const DeckKeyword& keyword, std::vector<ValidationError>& errors) const
    {
        const auto& it = m_keywords.find(keyword.name());
        if (it != m_keywords.end()) {
            // If the keyword is not supported, add an error for that.
            const auto& properties = it->second;
            errors.push_back(ValidationError {
                properties.critical, keyword.location(), 1, std::nullopt, std::nullopt, properties.message});
        } else {
            // Otherwise, check all its items.
            validateKeywordItems(keyword, m_string_items, errors);
            validateKeywordItems(keyword, m_int_items, errors);
            validateKeywordItems(keyword, m_double_items, errors);
        }
    }


    template <typename T>
    void KeywordValidator::validateKeywordItems(const DeckKeyword& keyword,
                                                const PartiallySupportedKeywords<T>& partially_supported_items,
                                                std::vector<ValidationError>& errors) const
    {
        const auto& keyword_properties = partially_supported_items.find(keyword.name());
        if (keyword_properties != partially_supported_items.end()) {
            // If this keyworcs has partially supported items, iterate over all of them.
            for (size_t record_index = 0; record_index < keyword.size(); record_index++) {
                const auto& record = keyword.getRecord(record_index);
                for (size_t item_index = 0; item_index < record.size(); item_index++) {
                    const auto& item = record.getItem(item_index);
                    // Find the index number, which starts counting at one, so item_index + 1
                    const auto& item_properties = keyword_properties->second.find(item_index + 1);
                    if (item_properties != keyword_properties->second.end()) {
                        if (item.hasValue(0)) {
                            // Validate the item, if it is partially supported.
                            validateKeywordItem<T>(keyword,
                                                   item_properties->second,
                                                   keyword.size() > 1,
                                                   record_index,
                                                   item_index,
                                                   item.get<T>(0),
                                                   errors);
                        }
                    }
                }
            }
        }
    }


    template <typename T>
    void KeywordValidator::validateKeywordItem(const DeckKeyword& keyword,
                                               const PartiallySupportedKeywordProperties<T>& properties,
                                               const bool multiple_records,
                                               const size_t record_index,
                                               const size_t item_index,
                                               const T& item_value,
                                               std::vector<ValidationError>& errors) const
    {
        if (!properties.validator(item_value)) {
            // If the value is not permitted, format the value to report it.
            std::string formatted_value;
            if constexpr (std::is_arithmetic<T>::value)
                formatted_value = std::to_string(item_value);
            else
                formatted_value = item_value;
            // Add the relevant information to the vector of errors. Record and
            // index numbers start at 1, so add 1. Pass zero for the record
            // index if there is only a single record.
            errors.push_back(ValidationError {properties.critical,
                                              keyword.location(),
                                              multiple_records ? record_index + 1 : 0,
                                              item_index + 1,
                                              formatted_value,
                                              properties.message});
        }
    }


} // namespace KeywordValidation

} // namespace Opm
